Beretta 84FS Mag Question

I just added a brand new 84FS Cheetah to my growing collection for $605.00 delivered. I think that is a pretty good price given the times we are in. My only problem is that it has the 10 round mags instead of the 13. I am woundering if anyone knows if the 10 cap mag can be modified (internal spacer removed etc.) to make it a 13 cap? I live in NC so currently I would not be in violation of the law but that is due to change any day if we are not carefull.